The Chasicoan ( or ) age is a period of geologic time from 10âÂÂ9 Ma within the Late Miocene epoch of the Neogene, used more specifically within the SALMA classification in South America. It follows the Mayoan and precedes the Huayquerian age.
Isotopic analysis of the fauna at Arroyo Chasicó, the type locality of the Chasicoan Stage/Age, indicates a paleoenvironment characterized by woodland and wooded C3 grassland, with some taxa showing mixed C3âÂÂC4 diets.
The Chasicoan is named after the Arroyo Chasicó Formation of the Colorado Basin in northeastern Argentina.